A terror plot to assassinate Prime Minister Theresa May has reportedly been foiled.
An Islamist extremist planned to blow up the gates of Downing Street and use pepper spray and a knife to try to kill the prime minister Theresa May, police say.
The disrupted plot against May included an explosive device that terrorists planned to detonate in front of May's residence on 10 Downing Street, a Sky News report said.
News of the arrest followed after Andrew Parker, the head of security agency MI5, told cabinet ministers about the plans on Monday.
Theresa May at Downing Street.
Earlier on Tuesday, May's spokesman said Britain had thwarted nine plots in the last 12 months.
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"There have been five attacks that got through, four of which are related to Islamist terrorism", he said.
There have been several terror attacks in London in the past year.
The revelations come in the wake of a report that showed the Manchester Arena suicide bomb which left 22 people dead in May could have been averted had "the cards fallen differently".
Prime ministers have always been terrorist targets, though Downing Street is now well protected by fortified gates and armed police officers.